  body {
    background-color: #383838;
  }
  .message-box {
  }
  .message-box .bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
  
    background-color: white;
    opacity: .6;
  }
  
  .message-box .card {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    min-width: 450px;
    min-height: 150px;
  
    background-color: white;
    border-radius: 10px;
    padding: 10px;
  }
  
  .message-box .card header {
    min-height: 30px;
    display: flex;
    justify-content: space-between;
  }
  .message-box .card footer {
    position: fixed;
    bottom: 0;
    min-height: 30px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: flex-end;
    padding: 10px;
  }
  